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<a name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a name="2" href="#2">2</a>   <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em>
<a name="3" href="#3">3</a>   <em class="jxr_comment"> * contributor license agreements.  See the NOTICE file distributed with</em>
<a name="4" href="#4">4</a>   <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em>
<a name="5" href="#5">5</a>   <em class="jxr_comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</em>
<a name="6" href="#6">6</a>   <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with</em>
<a name="7" href="#7">7</a>   <em class="jxr_comment"> * the License.  You may obtain a copy of the License at</em>
<a name="8" href="#8">8</a>   <em class="jxr_comment"> * </em>
<a name="9" href="#9">9</a>   <em class="jxr_comment"> *      <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="10" href="#10">10</a>  <em class="jxr_comment"> * </em>
<a name="11" href="#11">11</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a name="12" href="#12">12</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a name="13" href="#13">13</a>  <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a name="14" href="#14">14</a>  <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
<a name="15" href="#15">15</a>  <em class="jxr_comment"> * limitations under the License.</em>
<a name="16" href="#16">16</a>  <em class="jxr_comment"> */</em> 
<a name="17" href="#17">17</a>  
<a name="18" href="#18">18</a>  
<a name="19" href="#19">19</a>  <strong class="jxr_keyword">package</strong> org.apache.commons.logging.impl;
<a name="20" href="#20">20</a>  
<a name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> java.lang.ref.*;
<a name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> junit.framework.*;
<a name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.util.*;
<a name="24" href="#24">24</a>  
<a name="25" href="#25">25</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/commons/logging/impl/WeakHashtableTest.html">WeakHashtableTest</a> <strong class="jxr_keyword">extends</strong> TestCase {
<a name="26" href="#26">26</a>  
<a name="27" href="#27">27</a>      
<a name="28" href="#28">28</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Maximum number of iterations before our test fails */</em>
<a name="29" href="#29">29</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> MAX_GC_ITERATIONS = 50;
<a name="30" href="#30">30</a>  
<a name="31" href="#31">31</a>      <strong class="jxr_keyword">private</strong> WeakHashtable weakHashtable;
<a name="32" href="#32">32</a>      <strong class="jxr_keyword">private</strong> Long keyOne;
<a name="33" href="#33">33</a>      <strong class="jxr_keyword">private</strong> Long keyTwo;
<a name="34" href="#34">34</a>      <strong class="jxr_keyword">private</strong> Long keyThree;
<a name="35" href="#35">35</a>      <strong class="jxr_keyword">private</strong> Long valueOne;
<a name="36" href="#36">36</a>      <strong class="jxr_keyword">private</strong> Long valueTwo;
<a name="37" href="#37">37</a>      <strong class="jxr_keyword">private</strong> Long valueThree;
<a name="38" href="#38">38</a>  
<a name="39" href="#39">39</a>      <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/commons/logging/impl/WeakHashtableTest.html">WeakHashtableTest</a>(String testName) {
<a name="40" href="#40">40</a>          <strong class="jxr_keyword">super</strong>(testName);
<a name="41" href="#41">41</a>      }
<a name="42" href="#42">42</a>      
<a name="43" href="#43">43</a>  
<a name="44" href="#44">44</a>      <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> setUp() <strong class="jxr_keyword">throws</strong> Exception {
<a name="45" href="#45">45</a>          <strong class="jxr_keyword">super</strong>.setUp();
<a name="46" href="#46">46</a>          weakHashtable = <strong class="jxr_keyword">new</strong> WeakHashtable();
<a name="47" href="#47">47</a>          
<a name="48" href="#48">48</a>          keyOne = <strong class="jxr_keyword">new</strong> Long(1);
<a name="49" href="#49">49</a>          keyTwo = <strong class="jxr_keyword">new</strong> Long(2);
<a name="50" href="#50">50</a>          keyThree = <strong class="jxr_keyword">new</strong> Long(3);
<a name="51" href="#51">51</a>          valueOne = <strong class="jxr_keyword">new</strong> Long(100);
<a name="52" href="#52">52</a>          valueTwo = <strong class="jxr_keyword">new</strong> Long(200);
<a name="53" href="#53">53</a>          valueThree = <strong class="jxr_keyword">new</strong> Long(300);
<a name="54" href="#54">54</a>          
<a name="55" href="#55">55</a>          weakHashtable.put(keyOne, valueOne);
<a name="56" href="#56">56</a>          weakHashtable.put(keyTwo, valueTwo);
<a name="57" href="#57">57</a>          weakHashtable.put(keyThree, valueThree);
<a name="58" href="#58">58</a>      }
<a name="59" href="#59">59</a>  
<a name="60" href="#60">60</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Tests public boolean contains(Object value) */</em>
<a name="61" href="#61">61</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testContains() <strong class="jxr_keyword">throws</strong> Exception {
<a name="62" href="#62">62</a>          assertFalse(weakHashtable.contains(<strong class="jxr_keyword">new</strong> Long(1)));
<a name="63" href="#63">63</a>          assertFalse(weakHashtable.contains(<strong class="jxr_keyword">new</strong> Long(2)));
<a name="64" href="#64">64</a>          assertFalse(weakHashtable.contains(<strong class="jxr_keyword">new</strong> Long(3)));
<a name="65" href="#65">65</a>          assertTrue(weakHashtable.contains(<strong class="jxr_keyword">new</strong> Long(100)));
<a name="66" href="#66">66</a>          assertTrue(weakHashtable.contains(<strong class="jxr_keyword">new</strong> Long(200)));
<a name="67" href="#67">67</a>          assertTrue(weakHashtable.contains(<strong class="jxr_keyword">new</strong> Long(300)));
<a name="68" href="#68">68</a>          assertFalse(weakHashtable.contains(<strong class="jxr_keyword">new</strong> Long(400)));
<a name="69" href="#69">69</a>      }
<a name="70" href="#70">70</a>      
<a name="71" href="#71">71</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Tests public boolean containsKey(Object key) */</em>
<a name="72" href="#72">72</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testContainsKey() <strong class="jxr_keyword">throws</strong> Exception {
<a name="73" href="#73">73</a>          assertTrue(weakHashtable.containsKey(<strong class="jxr_keyword">new</strong> Long(1)));
<a name="74" href="#74">74</a>          assertTrue(weakHashtable.containsKey(<strong class="jxr_keyword">new</strong> Long(2)));
<a name="75" href="#75">75</a>          assertTrue(weakHashtable.containsKey(<strong class="jxr_keyword">new</strong> Long(3)));
<a name="76" href="#76">76</a>          assertFalse(weakHashtable.containsKey(<strong class="jxr_keyword">new</strong> Long(100)));
<a name="77" href="#77">77</a>          assertFalse(weakHashtable.containsKey(<strong class="jxr_keyword">new</strong> Long(200)));
<a name="78" href="#78">78</a>          assertFalse(weakHashtable.containsKey(<strong class="jxr_keyword">new</strong> Long(300)));
<a name="79" href="#79">79</a>          assertFalse(weakHashtable.containsKey(<strong class="jxr_keyword">new</strong> Long(400)));    
<a name="80" href="#80">80</a>      }
<a name="81" href="#81">81</a>      
<a name="82" href="#82">82</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Tests public boolean containsValue(Object value) */</em>
<a name="83" href="#83">83</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testContainsValue() <strong class="jxr_keyword">throws</strong> Exception {
<a name="84" href="#84">84</a>          assertFalse(weakHashtable.containsValue(<strong class="jxr_keyword">new</strong> Long(1)));
<a name="85" href="#85">85</a>          assertFalse(weakHashtable.containsValue(<strong class="jxr_keyword">new</strong> Long(2)));
<a name="86" href="#86">86</a>          assertFalse(weakHashtable.containsValue(<strong class="jxr_keyword">new</strong> Long(3)));
<a name="87" href="#87">87</a>          assertTrue(weakHashtable.containsValue(<strong class="jxr_keyword">new</strong> Long(100)));
<a name="88" href="#88">88</a>          assertTrue(weakHashtable.containsValue(<strong class="jxr_keyword">new</strong> Long(200)));
<a name="89" href="#89">89</a>          assertTrue(weakHashtable.containsValue(<strong class="jxr_keyword">new</strong> Long(300)));
<a name="90" href="#90">90</a>          assertFalse(weakHashtable.containsValue(<strong class="jxr_keyword">new</strong> Long(400)));    
<a name="91" href="#91">91</a>      }
<a name="92" href="#92">92</a>      
<a name="93" href="#93">93</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Tests public Enumeration elements() */</em>
<a name="94" href="#94">94</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testElements() <strong class="jxr_keyword">throws</strong> Exception {
<a name="95" href="#95">95</a>          ArrayList elements = <strong class="jxr_keyword">new</strong> ArrayList();
<a name="96" href="#96">96</a>          <strong class="jxr_keyword">for</strong> (Enumeration e = weakHashtable.elements(); e.hasMoreElements();) {
<a name="97" href="#97">97</a>              elements.add(e.nextElement());
<a name="98" href="#98">98</a>          }
<a name="99" href="#99">99</a>          assertEquals(3, elements.size());
<a name="100" href="#100">100</a>         assertTrue(elements.contains(valueOne));
<a name="101" href="#101">101</a>         assertTrue(elements.contains(valueTwo));
<a name="102" href="#102">102</a>         assertTrue(elements.contains(valueThree));
<a name="103" href="#103">103</a>     }
<a name="104" href="#104">104</a>     
<a name="105" href="#105">105</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Tests public Set entrySet() */</em>
<a name="106" href="#106">106</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testEntrySet() <strong class="jxr_keyword">throws</strong> Exception {
<a name="107" href="#107">107</a>         Set entrySet = weakHashtable.entrySet();
<a name="108" href="#108">108</a>         <strong class="jxr_keyword">for</strong> (Iterator it = entrySet.iterator(); it.hasNext();) {
<a name="109" href="#109">109</a>             Map.Entry entry = (Map.Entry) it.next();
<a name="110" href="#110">110</a>             Object key = entry.getKey();
<a name="111" href="#111">111</a>             <strong class="jxr_keyword">if</strong> (keyOne.equals(key)) {
<a name="112" href="#112">112</a>                 assertEquals(valueOne, entry.getValue());
<a name="113" href="#113">113</a>             } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (keyTwo.equals(key)) {
<a name="114" href="#114">114</a>                 assertEquals(valueTwo, entry.getValue());
<a name="115" href="#115">115</a>             } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (keyThree.equals(key)) {
<a name="116" href="#116">116</a>                 assertEquals(valueThree, entry.getValue());
<a name="117" href="#117">117</a>             } <strong class="jxr_keyword">else</strong> {
<a name="118" href="#118">118</a>                 fail(<span class="jxr_string">"Unexpected key"</span>);
<a name="119" href="#119">119</a>             }
<a name="120" href="#120">120</a>         }
<a name="121" href="#121">121</a>     }
<a name="122" href="#122">122</a>     
<a name="123" href="#123">123</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Tests public Object get(Object�key) */</em>
<a name="124" href="#124">124</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testGet() <strong class="jxr_keyword">throws</strong> Exception {
<a name="125" href="#125">125</a>         assertEquals(valueOne, weakHashtable.get(keyOne));
<a name="126" href="#126">126</a>         assertEquals(valueTwo, weakHashtable.get(keyTwo));
<a name="127" href="#127">127</a>         assertEquals(valueThree, weakHashtable.get(keyThree));
<a name="128" href="#128">128</a>         assertNull(weakHashtable.get(<strong class="jxr_keyword">new</strong> Long(50)));
<a name="129" href="#129">129</a>     }
<a name="130" href="#130">130</a>     
<a name="131" href="#131">131</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Tests public Enumeration keys() */</em>
<a name="132" href="#132">132</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testKeys() <strong class="jxr_keyword">throws</strong> Exception {
<a name="133" href="#133">133</a>         ArrayList keys = <strong class="jxr_keyword">new</strong> ArrayList();
<a name="134" href="#134">134</a>         <strong class="jxr_keyword">for</strong> (Enumeration e = weakHashtable.keys(); e.hasMoreElements();) {
<a name="135" href="#135">135</a>             keys.add(e.nextElement());
<a name="136" href="#136">136</a>         }
<a name="137" href="#137">137</a>         assertEquals(3, keys.size());
<a name="138" href="#138">138</a>         assertTrue(keys.contains(keyOne));
<a name="139" href="#139">139</a>         assertTrue(keys.contains(keyTwo));
<a name="140" href="#140">140</a>         assertTrue(keys.contains(keyThree));    
<a name="141" href="#141">141</a>     }
<a name="142" href="#142">142</a>     
<a name="143" href="#143">143</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Tests public Set keySet() */</em>
<a name="144" href="#144">144</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testKeySet() <strong class="jxr_keyword">throws</strong> Exception {
<a name="145" href="#145">145</a>         Set keySet = weakHashtable.keySet();
<a name="146" href="#146">146</a>         assertEquals(3, keySet.size());
<a name="147" href="#147">147</a>         assertTrue(keySet.contains(keyOne));
<a name="148" href="#148">148</a>         assertTrue(keySet.contains(keyTwo));
<a name="149" href="#149">149</a>         assertTrue(keySet.contains(keyThree));
<a name="150" href="#150">150</a>     }
<a name="151" href="#151">151</a>     
<a name="152" href="#152">152</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Tests public Object put(Object key, Object value) */</em>
<a name="153" href="#153">153</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testPut() <strong class="jxr_keyword">throws</strong> Exception {
<a name="154" href="#154">154</a>         Long anotherKey = <strong class="jxr_keyword">new</strong> Long(2004);
<a name="155" href="#155">155</a>         weakHashtable.put(anotherKey, <strong class="jxr_keyword">new</strong> Long(1066));
<a name="156" href="#156">156</a>         
<a name="157" href="#157">157</a>         assertEquals(<strong class="jxr_keyword">new</strong> Long(1066), weakHashtable.get(anotherKey));
<a name="158" href="#158">158</a>                
<a name="159" href="#159">159</a>         <em class="jxr_comment">// Test compliance with the hashtable API re nulls</em>
<a name="160" href="#160">160</a>         Exception caught = <strong class="jxr_keyword">null</strong>;
<a name="161" href="#161">161</a>         <strong class="jxr_keyword">try</strong> {
<a name="162" href="#162">162</a>             weakHashtable.put(<strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">new</strong> Object());
<a name="163" href="#163">163</a>         }
<a name="164" href="#164">164</a>         <strong class="jxr_keyword">catch</strong> (Exception e) {
<a name="165" href="#165">165</a>             caught = e;
<a name="166" href="#166">166</a>         }
<a name="167" href="#167">167</a>         assertNotNull(<span class="jxr_string">"did not throw an exception adding a null key"</span>, caught);
<a name="168" href="#168">168</a>         caught = <strong class="jxr_keyword">null</strong>;
<a name="169" href="#169">169</a>         <strong class="jxr_keyword">try</strong> {
<a name="170" href="#170">170</a>             weakHashtable.put(<strong class="jxr_keyword">new</strong> Object(), <strong class="jxr_keyword">null</strong>);
<a name="171" href="#171">171</a>         }
<a name="172" href="#172">172</a>         <strong class="jxr_keyword">catch</strong> (Exception e) {
<a name="173" href="#173">173</a>             caught = e;
<a name="174" href="#174">174</a>         }
<a name="175" href="#175">175</a>         assertNotNull(<span class="jxr_string">"did not throw an exception adding a null value"</span>, caught);
<a name="176" href="#176">176</a>     }
<a name="177" href="#177">177</a>     
<a name="178" href="#178">178</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Tests public void putAll(Map t) */</em>
<a name="179" href="#179">179</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testPutAll() <strong class="jxr_keyword">throws</strong> Exception {
<a name="180" href="#180">180</a>         Map newValues = <strong class="jxr_keyword">new</strong> HashMap();
<a name="181" href="#181">181</a>         Long newKey = <strong class="jxr_keyword">new</strong> Long(1066);
<a name="182" href="#182">182</a>         Long newValue = <strong class="jxr_keyword">new</strong> Long(1415);
<a name="183" href="#183">183</a>         newValues.put(newKey, newValue);
<a name="184" href="#184">184</a>         Long anotherNewKey = <strong class="jxr_keyword">new</strong> Long(1645);
<a name="185" href="#185">185</a>         Long anotherNewValue = <strong class="jxr_keyword">new</strong> Long(1815);
<a name="186" href="#186">186</a>         newValues.put(anotherNewKey, anotherNewValue);
<a name="187" href="#187">187</a>         weakHashtable.putAll(newValues);
<a name="188" href="#188">188</a>         
<a name="189" href="#189">189</a>         assertEquals(5, weakHashtable.size());
<a name="190" href="#190">190</a>         assertEquals(newValue, weakHashtable.get(newKey));
<a name="191" href="#191">191</a>         assertEquals(anotherNewValue, weakHashtable.get(anotherNewKey));
<a name="192" href="#192">192</a>     }
<a name="193" href="#193">193</a>     
<a name="194" href="#194">194</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Tests public Object remove(Object�key) */</em>
<a name="195" href="#195">195</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testRemove() <strong class="jxr_keyword">throws</strong> Exception {
<a name="196" href="#196">196</a>         weakHashtable.remove(keyOne);
<a name="197" href="#197">197</a>         assertEquals(2, weakHashtable.size());
<a name="198" href="#198">198</a>         assertNull(weakHashtable.get(keyOne));
<a name="199" href="#199">199</a>     }
<a name="200" href="#200">200</a>     
<a name="201" href="#201">201</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Tests public Collection values() */</em>
<a name="202" href="#202">202</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testValues() <strong class="jxr_keyword">throws</strong> Exception {
<a name="203" href="#203">203</a>         Collection values = weakHashtable.values();
<a name="204" href="#204">204</a>         assertEquals(3, values.size());
<a name="205" href="#205">205</a>         assertTrue(values.contains(valueOne));
<a name="206" href="#206">206</a>         assertTrue(values.contains(valueTwo));
<a name="207" href="#207">207</a>         assertTrue(values.contains(valueThree));
<a name="208" href="#208">208</a>     }
<a name="209" href="#209">209</a>     
<a name="210" href="#210">210</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testRelease() <strong class="jxr_keyword">throws</strong> Exception {
<a name="211" href="#211">211</a>         assertNotNull(weakHashtable.get(<strong class="jxr_keyword">new</strong> Long(1)));
<a name="212" href="#212">212</a>         ReferenceQueue testQueue = <strong class="jxr_keyword">new</strong> ReferenceQueue();
<a name="213" href="#213">213</a>         WeakReference weakKeyOne = <strong class="jxr_keyword">new</strong> WeakReference(keyOne, testQueue);
<a name="214" href="#214">214</a> 
<a name="215" href="#215">215</a>         <em class="jxr_comment">// lose our references</em>
<a name="216" href="#216">216</a>         keyOne = <strong class="jxr_keyword">null</strong>;
<a name="217" href="#217">217</a>         keyTwo = <strong class="jxr_keyword">null</strong>;
<a name="218" href="#218">218</a>         keyThree = <strong class="jxr_keyword">null</strong>;
<a name="219" href="#219">219</a>         valueOne = <strong class="jxr_keyword">null</strong>;
<a name="220" href="#220">220</a>         valueTwo = <strong class="jxr_keyword">null</strong>;
<a name="221" href="#221">221</a>         valueThree = <strong class="jxr_keyword">null</strong>;
<a name="222" href="#222">222</a>         
<a name="223" href="#223">223</a>         <strong class="jxr_keyword">int</strong> iterations = 0;
<a name="224" href="#224">224</a>         <strong class="jxr_keyword">int</strong> bytz = 2;
<a name="225" href="#225">225</a>         <strong class="jxr_keyword">while</strong>(<strong class="jxr_keyword">true</strong>) {
<a name="226" href="#226">226</a>             System.gc();
<a name="227" href="#227">227</a>             <strong class="jxr_keyword">if</strong>(iterations++ &gt; MAX_GC_ITERATIONS){
<a name="228" href="#228">228</a>                 fail(<span class="jxr_string">"Max iterations reached before resource released."</span>);
<a name="229" href="#229">229</a>             }
<a name="230" href="#230">230</a>             
<a name="231" href="#231">231</a>             <strong class="jxr_keyword">if</strong>(weakHashtable.get(<strong class="jxr_keyword">new</strong> Long(1)) == <strong class="jxr_keyword">null</strong>) {
<a name="232" href="#232">232</a>                 <strong class="jxr_keyword">break</strong>;
<a name="233" href="#233">233</a>                 
<a name="234" href="#234">234</a>             } <strong class="jxr_keyword">else</strong> {
<a name="235" href="#235">235</a>                 <em class="jxr_comment">// create garbage:</em>
<a name="236" href="#236">236</a>                 byte[] b =  <strong class="jxr_keyword">new</strong> byte[bytz];
<a name="237" href="#237">237</a>                 bytz = bytz * 2;
<a name="238" href="#238">238</a>             }
<a name="239" href="#239">239</a>         }
<a name="240" href="#240">240</a>         
<a name="241" href="#241">241</a>         <em class="jxr_comment">// some JVMs seem to take a little time to put references on </em>
<a name="242" href="#242">242</a>         <em class="jxr_comment">// the reference queue once the reference has been collected</em>
<a name="243" href="#243">243</a>         <em class="jxr_comment">// need to think about whether this is enough to justify</em>
<a name="244" href="#244">244</a>         <em class="jxr_comment">// stepping through the collection each time...</em>
<a name="245" href="#245">245</a>         <strong class="jxr_keyword">while</strong>(testQueue.poll() == <strong class="jxr_keyword">null</strong>) {}
<a name="246" href="#246">246</a>         
<a name="247" href="#247">247</a>         <em class="jxr_comment">// Test that the released objects are not taking space in the table</em>
<a name="248" href="#248">248</a>         assertEquals(<span class="jxr_string">"underlying table not emptied"</span>, 0, weakHashtable.size());
<a name="249" href="#249">249</a>     }
<a name="250" href="#250">250</a> }
</pre>
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